Because
type: WorkPerformance
piano: http://data.carnegiehall.org/names/1009
unspecified instrument: http://data.carnegiehall.org/names/7621
performer: http://data.carnegiehall.org/names/1009
performer: http://data.carnegiehall.org/names/7621
work performed: http://data.carnegiehall.org/works/24098